Ford F150 Pickup. Instruction — part 1661

Fig. 3: Identifying Control Components Location - EATC (1 Of 2)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 HVAC Control Components - F150 Pickup

Fig. 4: Identifying Control Components Location - EATC (2 Of 2)
Courtesy of FORD MOTOR CO.

Instruction Climate Control

The instruction climate control system heats or cools the vehicle interior depending on the function selector
position and the temperature selected. Function selector position determines heating or cooling and air
distribution. The temperature blend control setting determines air temperature.

The instruction climate control components are used to:

2003 Ford Pickup F150

2003 HVAC Control Components - F150 Pickup

z

select air inlet source (outside or recirculated).

z

select blower motor speed.

z

select discharge air temperature (temperature blend).

z

select discharge air location (defrost, panel, floor).

z

select A/C compressor clutch operation.

Instruction Climate Control System Inputs

Climate Control Assembly

The climate control assembly has three system controls:

z

The A/C heater function selector switch combines a vacuum selector valve with two electrical switches to
supply battery positive voltage (B+) to the A/C clutch circuit and the blower motor control circuit.

z

The temperature selection is accomplished with a potentiometer connected to the electric blend door
actuator that controls positioning of the temperature blend door. Movement of the control knob from
COOL (blue) to WARM (red) causes a corresponding movement on the air temperature control door and
determines the temperature that the system will maintain.

z

The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater
blower motor switch resistor.

Instruction Climate Control System Outputs

Blower Motor Switch Resistor

Blower Motor Resistor Coils

2003 Ford Pickup F150

2003 HVAC Control Components - F150 Pickup

Fig. 5: Locating Blower Motor Resistor Coils
Courtesy of FORD MOTOR CO.

Blower Motor Thermal Limiter

2003 Ford Pickup F150

2003 HVAC Control Components - F150 Pickup